Path: utzoo!attcan!uunet!husc6!bloom-beacon!tut.cis.ohio-state.edu!osu-cis!killer!vector!rpp386!pigs!haugj
From: haugj@pigs.UUCP (The Beach Bum)
Newsgroups: comp.unix.xenix
Subject: Re: SCO XENIX/386 and a slow lp
Summary: interrupt rate on parallel ports
Keywords: XENIX 386, lp is real slow
Message-ID: <406@pigs.UUCP>
Date: 13 Sep 88 21:09:29 GMT
References: <5470@killer.DALLAS.TX.US> <707@drexel.UUCP>
Reply-To: haugj@pigs.UUCP (The Beach Bum)
Organization: The Big "D" Home for Wayward Hackers
Lines: 16

In article <707@drexel.UUCP> jeff@drexel.UUCP (Jeff White) writes:
>  We have a Tandy 3000 (8 MHz 286) running SCO, and when printing, the system
>does slow down (most noticeable during screen updates).  The reason I think 
>this happens is that the parallel port generates an interrupt for every
>character sent to the port.

as simple as the interface to the parallel port board is, the parallel
printer driver should be able to handle 1000+ characters per second.

there was a patch from sco which may have caused this problem.  it
added a busy loop of some sort into the device driver.
-- 
=-=-=-=-=-=-=-The Beach Bum at The Big "D" Home for Wayward Hackers-=-=-=-=-=-=
               Very Long Address: John.F.Haugh@rpp386.dallas.tx.us
                         Very Short Address: jfh@rpp386
                           "ANSI C: Just say no" -- Me